|
|
Content .. 2359 2360 2361 2362 ..
EMISSIONS CONTROL DESCRIPTION MONITORED COMPONENT There are several components that will affect vehicle emissions if they malfunction. If one of these components Some of the component monitors are checking for proper operation of the part. Electrically operated components Any component that has an associated limp in will set a fault after 1 trip with the malfunction present. Refer to the Diagnostic Trouble Codes Description Charts in this section and the appropriate Powertrain Diagnostic The following is a list of the monitored components: • Catalyst Monitor • Comprehensive Components • EGR (if equipped) • Fuel Control (rich/lean) • Oxygen Sensor Monitor • Oxygen Sensor Heater Monitor • Purge • Misfire • Natural Vacuum Leak Detection (NVLD) COMPREHENSIVE COMPONENTS Along with the major monitors, OBD II requires that the diagnostic system monitor any component that could affect However, OBD II also requires that inputs from powertrain components to the PCM be tested for rationality, and 1. Circuit Continuity • Open • Shorted high • Shorted to ground 2. Rationality or Proper Functioning • Inputs tested for rationality • Outputs tested for functionality NOTE: Comprehensive component monitors are continuous. Therefore, enabling conditions do not apply. Input Rationality—While input signals to the PCM are constantly being monitored for electrical opens and shorts, PCM sensor inputs that are checked for rationality include: • Manifold Absolute Pressure (MAP) Sensor • Oxygen Sensor (O2S) (slow response) 25 - 2 EMISSIONS CONTROL LX |